The #425 bus runs from Strömsund to Gäddede. There’s one daily service and two buses on Fridays (w lanstrafiken-z.se). Travelling on a Friday is best since you can take the first bus, get off wherever you like (just tell the driver to stop), and spend the late afternoon and early evening walking or chilling out by the side of a lake before catching the second bus and continuing on to Gäddede. On weekdays the bus connects in Gäddede with the #472 to Stora Blåsjön and Anakarede, beside the pretty Stora Blåsjön lake.
There’s no bus connection from Stora Blåsjön over the Stekenjokk plateau to Klimpfjäll, but there are three other options: take a taxi from Stora Blåsjön (T 0672 201 53); hitch between the two places – there are a lot of German and Dutch camper vans on this stretch of the road who may be able to help out with a lift over the plateau; or hike from Ankarede towards Raukasjön lake before heading north up over the Norra Borgafjällen mountains for Slipsiken lake and down into Klimpfjäll – a distance of approximately 40km, best covered over two days.
Once at Klimpfjäll, bus #420 runs down to Saxnäs and Vilhelmina (Mon–Fri 2 daily, Sun 1 daily; w tabussen.nu).